CF/エポキシ複合材料の亜臨界水・超臨界メタノール処理から得られる回収炭素繊維の引張強度

敏郎 上田, 佳伸 島村, 東郷 敬一郎, 朋之 藤井, 岡島 いづみ, 正敬 平松, 猛 佐古
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引用次数: 4

Abstract

Carbon-fiber reinforced epoxy was decomposed using subcritical water and supercritical methanol to reclaim carbon fibers. The tensile strength of the reclaimed carbon fibers was measured. Then SEM observation, XPS, and Raman spectral analysis were conducted to elucidate the change of tensile strength caused by decomposition. The tensile strength decreased by 6% in the case of decomposition with supercritical methanol, and by 12~17% with subcritical water. The surfaces of reclaimed carbon fibers were resin-free. Decomposition did not affect the fiber surface and fracture surface morphology. Subsequent XPS analysis revealed that functional groups of the carbon fiber surface had been removed. Raman spectral analysis showed decreased graphitization of the carbon fiber surface. These results imply that the fracture toughness of the carbon fiber surface decreased because of breakage of carbon-carbon bonds in the carbon fibers as a result of decomposition.
CF /环氧复合材料的亚临界水、超临界甲醇处理得到的回收碳纤维的抗拉强度
采用亚临界水和超临界甲醇对碳纤维增强环氧树脂进行分解,回收碳纤维。测定了再生碳纤维的抗拉强度。然后通过SEM观察、XPS和拉曼光谱分析来阐明分解引起的抗拉强度变化。用超临界甲醇分解时,拉伸强度下降6%,用亚临界水分解时,拉伸强度下降12~17%。回收的碳纤维表面不含树脂。分解对纤维表面和断口表面形貌没有影响。随后的XPS分析显示,碳纤维表面的官能团已经被去除。拉曼光谱分析表明,碳纤维表面石墨化程度降低。这些结果表明,碳纤维表面的断裂韧性下降是由于分解导致碳纤维中的碳-碳键断裂。
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